Code table 4.2 - New parameters for ocean modelling (part 2)

[sebvi]

Summary and purpose

ECMWF is requesting many new ocean parameters for operational ocean modelling.

Action proposed

The team is kindly asked to review and approve the contents for inclusion within the next update to the WMO Manual on Codes.

Discussions

ECMWF is developing its next generation of ocean modelling which will output natively in GRIB2. This proposal contains the parameters needed for the second stage of the implementation, following the parameters requested for stage 1 in #96, #68 and #57

Detailed proposal

Add in Code Table 4.2

in discipline 0 - meteorology, category 2 - momentum

Discipline	Category	Code	Meaning	Units
0	2	49	Wind stress	N m-2
0	2	50	Eastward wind stress	N m-2
0	2	51	Northward wind stress	N m-2
0	2	52	u-component of wind stress	N m-2
0	2	53	v-component of wind stress	N m-2

in discipline 10 - oceanography, category 1 - currents

Discipline	Category	Code	Meaning	Units
10	1	5	Eastward component of current	m s-1
10	1	6	Northward component of current	m s-1

in discipline 10 - oceanography, category 2 - ice

Discipline	Category	Code	Meaning	Units
10	2	15	sea ice volume per unit area	m3 m-2
10	2	16	snow volume (over sea ice) per unit area	m3 m-2
10	2	17	Sea ice heat content	J m-2
10	2	18	Snow (over sea ice) heat content	J m-2
10	2	19	Ice freeboard thickness	m
10	2	20	Ice melt pond fraction	fraction
10	2	21	Ice melt pond depth	m
10	2	22	Ice melt pond volume per unit area	m3 m-2
10	2	23	Sea ice fraction tendency due to parameterisation	s-1

in discipline 10 - oceanography, category 3- surface properties

Discipline	Category	Code	Meaning	Units
10	3	13	Net upward water flux	kg m-2 s-1
10	3	14	Eastward surface water velocity	m s-1
10	3	15	Northward surface water velocity	m s-1
10	3	16	x-component of surface water velocity	m s-1
10	3	17	y-component of surface water velocity	m s-1
10	3	18	Heat flux correction	W m-2
10	3	19	Sea surface height tendency due to parameterisation	m s-1

in discipline 10 - oceanography, category 4 - sub-surface properties

Discipline	Category	Code	Meaning	Units
10	4	29	Bottom pressure equivalent height	m
10	4	30	Fresh water flux into sea water (from rivers)	kg m-2 s-1
10	4	31	Fresh water flux correction	kg m-2 s-1
10	4	32	Virtual salt flux into sea water	g kg-1 m-2 s-1
10	4	33	Virtual salt flux correction	g kg -1 m-2 s-1
10	4	34	Sea water temperature tendency due to Newtonian relaxation	k s-1
10	4	35	Sea water salinity tendency due to Newtonian relaxation	g kg-1 s-1
10	4	36	Sea water temperature tendency due to parameterisation	K s-1
10	4	37	Salinity tendency due to parameterisation	g kg -1 s-1
10	4	38	Eastward sea water velocity tendency due to parameterisation	m s-2
10	4	39	Northward sea water velocity tendency due to parameterisation	m s-2
10	4	40	Sea water temperature tendency due to direct bias correction	K s-1
10	4	41	Salinity tendency due to direct bias correction	g kg-1 s-1

[amilan17]

re: https://github.com/wmo-im/CCT/wiki/Teleconference-26-and-28.4.2022

Within ECMWF there is a move away from NetCDF to GRIB with the ocean models and new GRIB parameters are required. Internal experts at ECMWF are happy with the proposal but it would be good to get a second opinion from experts in the ocean modelling community on names, units etc to check for errors / clarity. David to follow up and identify who to consult with.

[amilan17]

https://github.com/wmo-im/CCT/wiki/Teleconference-18-and-19.5.2022 notes:

1. share new tables with ocean community that provided feedback before sending to NFPs.
2. change units to "gram per kg"....

[sebvi]

branch updated and units of salinity changed

[amilan17]

https://github.com/wmo-im/CCT/wiki/Teleconference-8.6.2022 notes:

• no new feedback since last meeting 
• @marijanacrepulja  branch is ready for validation
• note: it should be "grams per kg"

[marijanacrepulja]

@sebvi thanks for updating the branch.
@amilan17, the branch is validated. Please confirm and move to 'ready for FT'.

[amilan17]

@sebvi -
should the units be m-2 s-1 (as they were in the branch) or m s-2 (as they are in the issue summary)?

10	4	38	Eastward sea water velocity tendency due to parameterisation	m s-2
10	4	39	Northward sea water velocity tendency due to parameterisation	m s-2

[sebvi]

:O it should be m s-2 , like the proposal summary! Thanks for spotting this @amilan17 !